在使用 PHP 上传图像之前检查图像尺寸(高度和宽度)

Must I upload the image first and use "getimagesize()"? Or can I check this before uploading it using PHP?

<?php

foreach ($_FILES["files"]["error"] as $key => $error) {
if(
$error == UPLOAD_ERR_OK
&& $_FILES["files"]["size"][$key] < 500000 
&& $_FILES["files"]["type"][$key] == "image/gif"
|| $_FILES["files"]["type"][$key] == "image/png"
|| $_FILES["files"]["type"][$key] == "image/jpeg"
|| $_FILES["files"]["type"][$key] == "image/pjpeg" 
){


$filename = $_FILES["files"]["name"][$key];








if(HOW TO CHECK WIDTH AND HEIGHT)
{
echo '<p>image dimenssions must be less than 1000px width and 1000px height';
}


}







?>

推荐答案

您需要在实际上传发生之前在客户端上执行某些操作.
使用(服务器端)php，您只能在文件上传后或使用 upload hooks 可能在上传图像时(来自图像文件头数据).